Heat and smoke detector



FIG. 1 is a front perspective view of a heat and smoke detector showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof, with the opposite side being a mirror image. 

The ornamental design for a heat and smoke detector, as shown and described. 